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Securities - Summary of Securities (Parenthetical) (Detail) - CAD ($)
$ in Millions
3 Months Ended
Apr. 30, 2025
Oct. 31, 2024
Debt securities [member] | Financial assets at amortised cost, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Realized gain (loss) on disposal of debt securities $ 0 $ 0